I agree fully with you. I also think he might change his ideas on becoming immortal once he is a little older and comes to the conclusion that life has no meaning in itself and that even when you achieve a lot, everything while be undone in the future. Or when he realizes the lonelines of being smarter than most people. There is a strong correlation between intelligence and existential depression.

(I had thought about writing about this in my initial comment, but hesitated about stating it, because I did not feel at ease to write this about a person of his age.)